class Student(object):
    def __init__(self, name, score):
        self.name = name
        self.score = score

    def print_score(self):
        return self.score
    def get_grade(self):
        if self.score >= 90:
            return 'A'
        elif self.score >= 60:
            return 'B'
        else:
            return 'C'

def a_student():
    s = Student('Bob', 78)
    return s.print_score()

def a_student2():
    print(a_student())
    student_obj = a_student()
    print('2222',student_obj.get_grade())

a_student2()